my 1999 windstar se will not start

I went on trip up north , it was about 270km total km. no problem ran great, it was a saturday and i started all day no problems. than sunday i got up around 100pm when out to start my van up and it turn over , but would not start. i check and it has spark (plugs) but seems no gas . i changed the fuel filter. I hear the fuel pump when i turn the key on . could it be the anti theft or sensor that has shut it down . can anyone help or had same problem please let me know

First make sure you have good battery voltage ... 12+ volts ... and no loose terminals.

Then change out the PCM power relay, fuel pump relay, and the "switch power relays" ... please use new ones ... the relay layout is shown in the owners manual.

If you had the wiring diagram, it would make things much easier.

A real quick check, once you make sure that the battery terminal connections are clean and tight, is to try to "jump start" the vehicle with another vehicle.

If the battery is just slightly weak, it might have plenty of power to turn the engine over, but the voltage could be slightly low, causing the relays to not activate.

The relays need a minimum voltage to pull in, and the fuel pump needs the relays to run.
So your engine may crank fine, give you spark, but no fuel.

If this does not work, then you are on to checking into relays, and power to the fuel pump.

As far as the theft system your theft light would blink fast if active. If it just blinks normal than its OK. Also you can unhook the battery and reconnect to reset as well.

It was my spark plugs , changed them and it started right up .

Congratulations that it wasn't too gruesome!